[key-accumulator] Starting to reimplement the key-accumulator

src/objects.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/assert-scope.h"
@@ skipping 2025 matching lines @@
   inline bool HasFixedUint16Elements();
   inline bool HasFixedInt32Elements();
   inline bool HasFixedUint32Elements();
   inline bool HasFixedFloat32Elements();
   inline bool HasFixedFloat64Elements();
 
   inline bool HasFastArgumentsElements();
   inline bool HasSlowArgumentsElements();
   inline bool HasFastStringWrapperElements();
   inline bool HasSlowStringWrapperElements();
+  bool HasEnumerableElements();
+
   inline SeededNumberDictionary* element_dictionary();  // Gets slow elements.
 
   // Requires: HasFastElements().
   static void EnsureWritableFastElements(Handle<JSObject> object);
 
   // Collects elements starting at index 0.
   // Undefined values are placed after non-undefined values.
   // Returns the number of non-undefined values.
   static Handle<Object> PrepareElementsForSort(Handle<JSObject> object,
                                                uint32_t limit);
@@ skipping 231 matching lines @@
   // with the specified attributes (ignoring interceptors).
   // TODO(jkummerow): Deprecated, only used by Object.observe.
   int GetOwnElementKeys(FixedArray* storage, PropertyFilter filter);
 
   static void CollectOwnElementKeys(Handle<JSObject> object,
                                     KeyAccumulator* keys,
                                     PropertyFilter filter);
 
   static Handle<FixedArray> GetEnumPropertyKeys(Handle<JSObject> object);
 
+  static Handle<FixedArray> GetFastEnumPropertyKeys(Isolate* isolate,
+                                                    Handle<JSObject> object);
+
   // Returns a new map with all transitions dropped from the object's current
   // map and the ElementsKind set.
   static Handle<Map> GetElementsTransitionMap(Handle<JSObject> object,
                                               ElementsKind to_kind);
   static void TransitionElementsKind(Handle<JSObject> object,
                                      ElementsKind to_kind);
 
   // Always use this to migrate an object to a new map.
   // |expected_additional_properties| is only used for fast-to-slow transitions
   // and ignored otherwise.
@@ skipping 8557 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_